diff mbox series

[v2,3/3] arm64: dts: meson-g12-common: Use the G12A UART compatible string

Message ID 20230306194223.1869814-4-martin.blumenstingl@googlemail.com
State Superseded
Headers show
Series meson-uart: Use "divide XTAL by 2" bit on G12A | expand

Commit Message

Martin Blumenstingl March 6, 2023, 7:42 p.m. UTC 
Switch meson-12-common.dtsi to use the Meson G12A specific UART
compatible string. This enables the "divide XTAL by 2" divider which
improves support for UART attached Bluetooth modules (for example
RTL8822CS) running at a baud rate of 1500000. Without dividing XTAL
(24MHz) by 2 a baud rate of 1500000 cannot be generated cleanly and the
resulting jitter breaks communication with the module.

Tested-by: Christian Hewitt <christianshewitt@gmail.com>
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
---
Greg, please don't take this through your tree. I included this patch
to show the overall goal of this series. If Neil won't take this as
part of another series then I'll send it separately.

Changes from v1 -> v2:
- keep meson-gx-uart as fallback compatible string


 arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)
diff mbox series

Patch

diff --git a/arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi b/arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi
index 123a56f7f818..904bcd4d2acf 100644
--- a/arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi
+++ b/arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi
@@ -2046,7 +2046,8 @@  pwm_AO_cd: pwm@2000 {
 			};
 
 			uart_AO: serial@3000 {
-				compatible = "amlogic,meson-gx-uart",
+				compatible = "amlogic,meson-g12a-uart",
+					     "amlogic,meson-gx-uart",
 					     "amlogic,meson-ao-uart";
 				reg = <0x0 0x3000 0x0 0x18>;
 				interrupts = <GIC_SPI 193 IRQ_TYPE_EDGE_RISING>;
@@ -2056,7 +2057,8 @@  uart_AO: serial@3000 {
 			};
 
 			uart_AO_B: serial@4000 {
-				compatible = "amlogic,meson-gx-uart",
+				compatible = "amlogic,meson-g12a-uart",
+					     "amlogic,meson-gx-uart",
 					     "amlogic,meson-ao-uart";
 				reg = <0x0 0x4000 0x0 0x18>;
 				interrupts = <GIC_SPI 197 IRQ_TYPE_EDGE_RISING>;
@@ -2293,7 +2295,8 @@  clk_msr: clock-measure@18000 {
 			};
 
 			uart_C: serial@22000 {
-				compatible = "amlogic,meson-gx-uart";
+				compatible = "amlogic,meson-g12a-uart",
+					     "amlogic,meson-gx-uart";
 				reg = <0x0 0x22000 0x0 0x18>;
 				interrupts = <GIC_SPI 93 IRQ_TYPE_EDGE_RISING>;
 				clocks = <&xtal>, <&clkc CLKID_UART2>, <&xtal>;
@@ -2302,7 +2305,8 @@  uart_C: serial@22000 {
 			};
 
 			uart_B: serial@23000 {
-				compatible = "amlogic,meson-gx-uart";
+				compatible = "amlogic,meson-g12a-uart",
+					     "amlogic,meson-gx-uart";
 				reg = <0x0 0x23000 0x0 0x18>;
 				interrupts = <GIC_SPI 75 IRQ_TYPE_EDGE_RISING>;
 				clocks = <&xtal>, <&clkc CLKID_UART1>, <&xtal>;
@@ -2311,7 +2315,8 @@  uart_B: serial@23000 {
 			};
 
 			uart_A: serial@24000 {
-				compatible = "amlogic,meson-gx-uart";
+				compatible = "amlogic,meson-g12a-uart",
+					     "amlogic,meson-gx-uart";
 				reg = <0x0 0x24000 0x0 0x18>;
 				interrupts = <GIC_SPI 26 IRQ_TYPE_EDGE_RISING>;
 				clocks = <&xtal>, <&clkc CLKID_UART0>, <&xtal>;